List.Split Function in Power Query
The List.Split function splits the given list into a list of lists using the specified page size.
Syntax
 List.Split(list as list, pageSize as number) as list 
Example:
Power Query M
let
  source = {"India", "America", "Canada", "Japan", "Australia", "England", "China"}, 
  return = List.Split(source, 2)
in
  return   The output of the above code is shown below:
{{"India", "America"}, {"Canada", "Japan"}, {"Australia", "England"}, {"China"}}